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#!/usr/bin/env python
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Usage: merge-event-log-tags.py [-o output_file] [input_files...]
Merge together zero or more event-logs-tags files to produce a single
output file, stripped of comments. Checks that no tag numbers conflict
and fails if they do.
-h to display this usage message and exit.
"""
import cStringIO
import getopt
try:
import hashlib
except ImportError:
import md5 as hashlib
import struct
import sys
import event_log_tags
errors = []
warnings = []
output_file = None
pre_merged_file = None
# Tags with a tag number of ? are assigned a tag in the range
# [ASSIGN_START, ASSIGN_LIMIT).
ASSIGN_START = 900000
ASSIGN_LIMIT = 1000000
try:
opts, args = getopt.getopt(sys.argv[1:], "ho:m:")
except getopt.GetoptError, err:
print str(err)
print __doc__
sys.exit(2)
for o, a in opts:
if o == "-h":
print __doc__
sys.exit(2)
elif o == "-o":
output_file = a
elif o == "-m":
pre_merged_file = a
else:
print >> sys.stderr, "unhandled option %s" % (o,)
sys.exit(1)
# Restrictions on tags:
#
# Tag names must be unique. (If the tag number and description are
# also the same, a warning is issued instead of an error.)
#
# Explicit tag numbers must be unique. (If the tag name is also the
# same, no error is issued because the above rule will issue a
# warning or error.)
by_tagname = {}
by_tagnum = {}
pre_merged_tags = {}
if pre_merged_file:
for t in event_log_tags.TagFile(pre_merged_file).tags:
pre_merged_tags[t.tagname] = t
for fn in args:
tagfile = event_log_tags.TagFile(fn)
for t in tagfile.tags:
tagnum = t.tagnum
tagname = t.tagname
description = t.description
if t.tagname in by_tagname:
orig = by_tagname[t.tagname]
# Allow an explicit tag number to define an implicit tag number
if orig.tagnum is None:
orig.tagnum = t.tagnum
elif t.tagnum is None:
t.tagnum = orig.tagnum
if (t.tagnum == orig.tagnum and
t.description == orig.description):
# if the name and description are identical, issue a warning
# instead of failing (to make it easier to move tags between
# projects without breaking the build).
tagfile.AddWarning("tag \"%s\" (%s) duplicated in %s:%d" %
(t.tagname, t.tagnum, orig.filename, orig.linenum),
linenum=t.linenum)
else:
tagfile.AddError(
"tag name \"%s\" used by conflicting tag %s from %s:%d" %
(t.tagname, orig.tagnum, orig.filename, orig.linenum),
linenum=t.linenum)
continue
if t.tagnum is not None and t.tagnum in by_tagnum:
orig = by_tagnum[t.tagnum]
if t.tagname != orig.tagname:
tagfile.AddError(
"tag number %d used by conflicting tag \"%s\" from %s:%d" %
(t.tagnum, orig.tagname, orig.filename, orig.linenum),
linenum=t.linenum)
continue
by_tagname[t.tagname] = t
if t.tagnum is not None:
by_tagnum[t.tagnum] = t
errors.extend(tagfile.errors)
warnings.extend(tagfile.warnings)
if errors:
for fn, ln, msg in errors:
print >> sys.stderr, "%s:%d: error: %s" % (fn, ln, msg)
sys.exit(1)
if warnings:
for fn, ln, msg in warnings:
print >> sys.stderr, "%s:%d: warning: %s" % (fn, ln, msg)
# Python's hash function (a) isn't great and (b) varies between
# versions of python. Using md5 is overkill here but is the same from
# platform to platform and speed shouldn't matter in practice.
def hashname(str):
d = hashlib.md5(str).digest()[:4]
return struct.unpack("!I", d)[0]
# Assign a tag number to all the entries that say they want one
# assigned. We do this based on a hash of the tag name so that the
# numbers should stay relatively stable as tags are added.
# If we were provided pre-merged tags (w/ the -m option), then don't
# ever try to allocate one, just fail if we don't have a number
for name, t in sorted(by_tagname.iteritems()):
if t.tagnum is None:
if pre_merged_tags:
try:
t.tagnum = pre_merged_tags[t.tagname]
except KeyError:
print >> sys.stderr, ("Error: Tag number not defined for tag `%s'."
+" Have you done a full build?") % t.tagname
sys.exit(1)
else:
while True:
x = (hashname(name) % (ASSIGN_LIMIT - ASSIGN_START - 1)) + ASSIGN_START
if x not in by_tagnum:
t.tagnum = x
by_tagnum[x] = t
break
name = "_" + name
# by_tagnum should be complete now; we've assigned numbers to all tags.
buffer = cStringIO.StringIO()
for n, t in sorted(by_tagnum.iteritems()):
if t.description:
buffer.write("%d %s %s\n" % (t.tagnum, t.tagname, t.description))
else:
buffer.write("%d %s\n" % (t.tagnum, t.tagname))
event_log_tags.WriteOutput(output_file, buffer)
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